if he got the vaccination you can expect this:
Possible Side Effects to the Canine Distemper Vaccine
Lethargy - After receiving its vaccination, a dog may want to just lie around and sleep, avoiding its typical activities.
Slight fever - Some dogs react to vaccinations with a slightly elevated temperature.
Swelling at the injection site - Dogs occasionally get a lump at the injection site that absorbs into their system within a day or two.
Loss of appetite - Loss of appetite is another minor side effect to the distemper vaccine.
While the majority of reactions to the distemper vaccine are minor, should the dog react with swelling of the face, diarrhea or vomiting, or become unresponsive, contact your veterinarian immediately.